It seems from the detailed data in the Agfa pdf files, everything about them to the last detail is the same. And being a phenidone-hydroquinone developer, there is no similarity to Rodinal. My guess (sorry to be not definitive) is that the marketing team wanted to use the famous word "Rodinal" but the more circumspect members of Agfa wanted a less ridiculous name. They couldn't agree, so they sold it under two names!
It does seem that in each market, only one is sold. Here (Australia) it's Rodinal Special. I've never tried it, but some people think it really is "Special."